How to convert a function to a recursive function

Hey guys I don’t know if I can ask this but I’m working on the original files in google collab and I wrote a function that sums all the sizes of the file

import os
def recls_rtsize(argpath):
  sumsize = 0
  for entry in os.scandir(argpath):
    path= argpath+'/'+entry.name
    size= os.path.getsize(path)
    sumsize+=size
  return sumsize
print("total:",recls_rtsize('/var/log'))

But I need a way to make this function a recursive function or if there is some kind of formula or idea to convert no-recursive into recursive

>Solution :

For example, you could write helper function to process it recursively, although I don’t understand the purpose:

import os


def recls_rtsize(argpath):
    def helper(dirs):
        if not dirs:
            return 0
        path = argpath + '/' + dirs[0].name
        size = os.path.getsize(path)
        return size + helper(dirs[1:])

    return helper(list(os.scandir(argpath)))


print("total:", recls_rtsize('testing_package'))

Explanation:

Let’s say argpath contains several files:

argpath = [file1, file2, file2]

Then the function calls would be:

size(file1) + recls_rtsize([file2, file2]) we pass everything after the first element

size(file1) + size(file2) + recls_rtsize([file3])

size(file1) + size(file2) + size(file3) + recls_rtsize([])
There are no elements left, and we return 0 and start backtracking

size(file1) + size(file2) + size(file3) + 0

size(file1) + size(file2) + (size(file3) + 0)

size(file1) + (size(file2) + (size(file3) + 0))

(size(file1) + (size(file2) + (size(file3) + 0))) # our result

I hope it make sense